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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eda5723a3c4b90d881a45bf73b4a5b0621cb76e5b2572c38c33629e48ed290f' 
  AND token = 'v1pBkvlQWUd3eiWa4yk56ZNBF9Bf+vuQsV5NSpIKz/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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