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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035798dd9ee768c344db904edc66ca8d5befca83f486761859555fc31c060220' 
  AND token = 'sU8pcYz7K0EuPfW1n3LyIZc0Es9QsD8qE2B0f1w3W00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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