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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31960b3c2e892304f9ac2e7860f8765e180cae5f9348e4067d26e6667cd066d' 
  AND token = 'ozHC6d8pCzpxu9HWqFEDz2PESq3hDApOatcom/ZmcC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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