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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4541490693c992376a2d6c5beab5c447131d89a02875cf307fe638b71abd7f48' 
  AND token = 'cNspGeDch4iJtzdWMfFo2wshmh00SoHJgP1eos3XuW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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