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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e04a5e2126a7dbbc9222b0ff6575fdc9131f8432af9e62cd90fe12ccf4725c' 
  AND token = '/nni365Lplr1zfo1Y0Je6QmC0eFuWPLHRcASETFSnJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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