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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8cad1040849f158b59812f0ee023a250583c8f3c1a4a6c8e1b7047f782e767' 
  AND token = 'HV/valmsS4ECOxzq9qQeRUIlmbRU4G+q6K2kLJmfsp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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