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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9bace1d976a3f5e9d729069aca4ca437d9ad8d542b200d0c1b831a1ed66959' 
  AND token = 'mRt01oOb/73GYdXgfA+YEBgnzFIQ/J7c0FEOnM/eFrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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