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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417a63e1ac11feeb0f71b21dfc60c0465dcc436e8961123da13a6dd8c4774092' 
  AND token = 'PXDTpEtlCPIt7elHo9t/lrLT4EgYSfJ0YTdmlnTi6/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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