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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab8f45929cfe5b7e6c401fa13723704456f10dc4f08ea6ed2ade731c96ea7bc' 
  AND token = 'UUrEzpM8Iq7oTyxY3J2NWzHNUfdZdVEyrAStP3LfOp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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