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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504f932ba6883c1fc7d29788ad7edffb6fea13feadb5ffe9017921504d8e1897' 
  AND token = 'jzZ4J4bcSCb2TC0mMtXrFeOsJ4BhinRBK4tJtisVfAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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