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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea200f82d0fb299c4cdb1c9f99833aca4043cc614b108f61cc39c98dadf327e' 
  AND token = 'mQoak51jHE/5tNSU8ZKA6AC01K1Nv6YNh0p4T6Db9fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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