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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0943ae9e463f6098f4207be9bbe3363be85923bd2eac9a13d25e1817b2ac1be5' 
  AND token = 'mPyvbRmPAdaNZM7NWsHiU58GLBys5AD5b4BI9zk6+HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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