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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cfcd7141442c4c47ef611ca8cc3353504dc999be05f2b88a864b0a65eef870' 
  AND token = 'BEJC1oPII4FAo/IGtVf0ADgsQJLE0um+pngpm9+5cVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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