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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d13cbe0c6d2bac91ee361a7d236427d733f18499490b67183e6157ab1b1f0bf' 
  AND token = 'NznpeKmGUuB6Nr95bi1VBcTXF8Fkk1Bkab8v8jxvI0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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