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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e626732d0e861fdab5888025e449751e8ed23947f9496cd3225ebf2cc35c22' 
  AND token = 'DLUyk0a41Ka/5b5oc2G0Go3G09999+eIvzav/Trm0vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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