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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b944c53e54be657ebd33e689d0b673fab0564c1ccf65ab58b40c87cf90e8ad' 
  AND token = 'bVu/pY43IboGneWO868hyHCHsLJXpy6oF0sLFOLRC+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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