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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3201f9e4177a12bb9487c4ec973f2be9e2d64986f237b5004022e28810102e9' 
  AND token = 'zhWya1WtGXXlhYKdDBYjKZ7X8i2NwpIsS7ExQj8D12Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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