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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2cdeceea502a0bd0837c9bf7a1ed9060a19a56666b8b3ac153a42bf11256d1' 
  AND token = 'uDjQjc4R+ciUCGo6Z5IJa2HOMUYCSbjS+bDt9Qw2xyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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