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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aba2fbce2fc1d3b8bdb3f398ee9a95f5b88a67dc383b8d5f30afc862a570def' 
  AND token = 'neXigYe0C18/VEGegoErOF/d5pY+qwbbZt9ZHzxaxCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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