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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eba5cafd3d71645fe0ce426dbd9e262561fd166a442d82929f9d62b71b4405c' 
  AND token = 'mMzamAVFUA9PaxGy9MJ85w3P1xdFhjuPl+P6reTdbc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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