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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5d0b3a8c4d2d9ef84b351cff9627b8f912dc11a33bda9818531aaceb64ffe8' 
  AND token = 'oSQnfUhJGF1AsGJa6/IQDjVbO7odTkebh+H21Zga6d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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