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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da066fb9fc084e858e0857e7aa5fe4d84936fb9e9fe69538e64789c09502ee36' 
  AND token = 'NKLGtGLDKBaHRDw/PMDf8FCDCyL+NlaQ117XtBnAuHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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