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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c042e39f1ad61c09da1b81692f01912c27b7cd3b4ec66c53ffc09feeb937b1d' 
  AND token = 'dQB8Uuqqe4R4UoieFVsgG46iZPmvMx18jDMs4iKO40k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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