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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1c7ee8546b310983968721d3dadc3933e6f6f407bc16f7d87cf43d7f69bc10' 
  AND token = '5BuIOYuiD2Ng/oxmocs6seH0ws/byY1E2JMlexBBd4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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