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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b210beda47c005bd007a5c682ed6e7ad9604b088f811b1ccbcb788e36b50865c' 
  AND token = '0bppnw7QitLswX6wPNJ02UJ2wn6eYx04hX4DETx2dxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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