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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbee53cc15e2bae526e3ebd33a3e5c88dcc17a89d88e24a87a675f554dd296b' 
  AND token = 'PGvBeXeUk8Ew4jnkZDdbCK8upAuj66vM6jpRt/oMdRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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