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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcecc23644c8cc4328b3da13fd19b9a39a2c24e3b42a9287fb71be1a110a438' 
  AND token = 'SLLAobgVILLiMnRTR13KmtobaIsMjdy+kQ2/zcWrX/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}