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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a685eca3bc31b354e8d6eef44a46cc301cb16da9c9aba2c6221f46ff0c3b7097' 
  AND token = '1OCsLZOBEqY8hlqMVkEwIQu1yPayYTGbHVS2lD/UjWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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