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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1f333f971375d20c76cddccb9f676843df85b2b6d2b044ab4824a945827a05' 
  AND token = 'wTWkALThQtQfFQva8dLAFesqGOxhCISBDM0n4ddkDE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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