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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a0071a1be95c339f978339e692262e009671b9078dbed449428c5e8f132ac3' 
  AND token = 'KeHcfestz5H0DNqpJExHRoWovavn7tUn99QlL+K0q8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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