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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b7485db0d699d3db0f3a4b062f0ac8f2b555db745dd7392a67608e00af9778' 
  AND token = 'uUQBiU5V3log1MoDSntx70yycRrdTeY3AaIjn91OnFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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