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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47519426de0f7fa351b2587382e5ffb62b1d2d974b9c1fcc87e215efc3d45f39' 
  AND token = '8JkMLt4P2h2X4eBRkchWw4UAG3WpmLs6pLsONkNecmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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