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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8928739be8af9788cd3a720946e2f61b4f390b1d0d970fc831dd7a296bc3912' 
  AND token = 'sAWjFc79dCCTlngb4WrNO7XpgRNdKhflaUPdEBffWio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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