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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7827030f810a8302a6a8725c95f22f8a9979ad46e413119db8d9bbe8c8789dd5' 
  AND token = '1SVbMMSS9Y7cJQgzG5wxdiH98XNnC8bVFk++6kMsE9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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