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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d080bfe93278773c5c1f78784e5d94f8e159cabbcd03d585dc3a07f9cc4053' 
  AND token = 'ZMklQ8Xfjpwz4HIXxDqd1Yj5yGq52HRtlePksyPxS04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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