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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da5947a2a4e7e486adb719f998d54b982f219038a7a7dec57682f7945eaa497' 
  AND token = 'opne+SHUyqh83OLQi0IYwgS3lwJK7fgwMtt/V1HwPwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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