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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e50cc8f9945f4850871eadeaac795c17380e65185ede7192a94c78381c72e78' 
  AND token = 'lKgmH7upeCb4mw6mPAlv1KxuvxEZMXNE9kfZqNcy2pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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