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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c447480a4611b512ecb259c9dd40d35505679c909ae465188a9247b9e2ec0df4' 
  AND token = 'WXFsqPPBR6C8V/kJX2MMUqDPXuSL5r3Dlleb90zSlY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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