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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f1b513363ef00daa906e1ed0aa95991dcad905bae7792ad07148ff9f616453' 
  AND token = 'PYeikBCO6RqIVa77COanOqwoT3FVdM2LzQf2/PXLCDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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