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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19965c3ced8090fa5d5c807969417397f2ffbf832a6c32911420a1a7c8bd62af' 
  AND token = 'ukG7Wlu9k3196DX2nSBNPiupFxlYkB2uWh95Ai/Lcdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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