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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba00c68782f5dd0b9b7e342d483b65c99b867adbdeac13c5a3ab4893a29a76f0' 
  AND token = 'Q/je5OF6aK0U3OLJDv1r4UBxztr3YjuxQrfjKOzTFiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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