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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5531fa93a0da54b2cbe51410d08525ad96da2cd3769ec827a188569106e2b8c' 
  AND token = 'psregvjgv5w4/aLPaOesGdb3ZQrz0Aphd0yjdYf9UL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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