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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176167adcd5496056a0e52560a3188f8e991dbfa1323b41565e51d845d9107c9' 
  AND token = 'P4LFAH7YqDeKCldMC3UO1RBSv21XXDQVZSQap2umKng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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