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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a633229668bda48f1223792a586ad47a3200684414c4c6b4a2c0c953380c91b6' 
  AND token = 'ecGXH0TVnf8rM3OS0NntbS/rrfAdf2v6Fq9EMJN4sfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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