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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17edfc12ba61fab245790013a6a81efd242cca871f6e17ee91f04b9d9661ab23' 
  AND token = 'qYAs9SCka0IXDm5eKS/mE7nQbxyf2N6xsxjU0GMsDcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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