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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad0f6636cc82769452dc21f74f425147244944c3f5bc9f7475b416a35afd5d3' 
  AND token = '6+Mxq94qsxzvuW9Yx2qCQ1p1uQpyHdWDLZ851yRs8nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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