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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624e00f18d3466ece002a21d676d6bf3d5e2cf391481648f02c8f830d80f8c8a' 
  AND token = 'M6KmbPBJs7PspLiHAOoGSIOtRxQTA6B/CJ08LD4BESw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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