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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97792b24f9b3dd3d23a58d0ca4da2dc87c5acca8c69e95ccfeb974b5aac48be' 
  AND token = 'L9F6trXwr01DDSu3jNwNeZWKXyi3N5i8PJkOFblzJaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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