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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c33150f651f3e48e51fec11cff13ca2c1fbb58e60b21f5081c0bfd6e4460ea2' 
  AND token = 'CKHODOhYxGz8UYM+jJeQ6QKDDxVQ9xtYT7lHI+otyGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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