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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a9e6d21dd38d0c2164a60ec54ae6faea8348733b628483d83721df6d2cfb13' 
  AND token = 'mdyDfZemYzE29uFzJSnbtcWGmkZTrIBGVRW1cEL3cB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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