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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc59187cc7fa4ee6d079e406597f3db38b8bda098bb2cfc04a9dc2f12058339d' 
  AND token = 'fotY9gmyej0PXRg1+yH9JFs5in+IQBcv+EC27lifgek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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