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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c795f287c2f21f54b371116041c9b91174a78f95d6d0772f05fc5828db6429b7' 
  AND token = 'mn1RIIFnmFwl5T23qjpHybOi2N0c5OQSmO6/FiaAzvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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