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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4e74f0b9dc7a166e30c2bbfbfe417ed5f32544bb9644ddaefef368ab0a4e51' 
  AND token = 'RHVoF1St4uL6uQRMiy/vwclS31goJUrC8RKgH+1kvcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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