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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77799099673ebccceb0ef4a432e5ee468e510fa9865cc2bf0801e3d2b1c2534' 
  AND token = 'GyEZmsulRhApZZ94uJtkk7F8V7hrXGF8MxshnO2b1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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