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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7c96e97483d320dc7e3dd9ff43071d289028ef5559a4071b8b6901d3987dd7' 
  AND token = 'f/pCpu363DC6wa4aWKonrd1qCPGT5fRbU+pd245E3Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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