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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc805749be7a33a597736a520fadf3b2ed6a6ed5af6337cc829e8bb4f4b1ffb' 
  AND token = '+Qhdx24fzjYb8odWl4DADbk9I72RhvGM4Pk9jZgQaOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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