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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26c4c69527306d3ccc5802428873cb2dd86c8df023c51ade562c5fb314ff8e4' 
  AND token = 'YDPGatxFQPa21Skpl4eNkpVRlnM/6C+A5p6Q/23GN/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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