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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e264d6aa4a66cac27518ce602b5c6ff90133dfae597b01a62ae9a84143edce' 
  AND token = 'B7nrrKdxEe8htYr1Y8XjcVYOMIv8wJA1wgvRllUfupM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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