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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282a711ca7773ecd2ad5638a710284eda0d275274a6e72c7d4ddafa047b0b6a6' 
  AND token = 'cgjKGI1dBYEuR9Cewz6cIrEvxuDQgsQ/t/LObu473Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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