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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935b67e39ca187d4e15036f76248c27ccd5d3fb6873773b2c2dbf1749af118af' 
  AND token = 'bBiZu8BjHnyBoUUaqATk/RABA1Mewo4H1sD6vMucGQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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